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Related Experiment Videos

Amount-dependent temporal discounting?

Ee Lin Ong1, K Geoffrey White

  • 1Department of Psychology, University of Otago, Dunedin, New Zealand.

Behavioural Processes
|May 26, 2004
PubMed
Summary
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This study investigated amount-dependent temporal discounting in pigeons, finding no evidence for it in their choices. Pigeons may not discount larger rewards more steeply, unlike humans, suggesting procedural differences influence findings.

Area of Science:

  • Behavioral Economics
  • Animal Cognition
  • Decision Science

Background:

  • Amount-dependent temporal discounting describes how reward size influences choices over time, observed in humans but not previously in pigeons.
  • Grace's prior study found no evidence of amount-dependent temporal discounting in pigeons using a concurrent-chains procedure.

Purpose of the Study:

  • To re-examine amount-dependent temporal discounting in pigeons using modified concurrent-chains procedures.
  • To investigate whether enhanced discrimination between outcome magnitudes affects discounting behavior in pigeons.

Main Methods:

  • Pigeons' choices in a concurrent-chains procedure were analyzed under conditions designed to improve discrimination of outcome amounts and delays.
  • Two experiments were conducted, modifying reinforcer durations and maintaining constant reinforcer amounts between choice alternatives.

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Main Results:

  • Experiment 1 showed increased sensitivity to delay ratios with larger reinforcer durations, potentially indicating reversed discounting or enhanced discrimination.
  • Experiment 2 results supported Grace's conclusion, finding no evidence for amount-dependent temporal discounting in pigeons.

Conclusions:

  • Pigeons' choice behavior in concurrent chains does not appear to be characterized by amount-dependent temporal discounting.
  • Divergent findings between human and pigeon studies may stem from procedural differences (titration vs. concurrent chains) and the role of reinforcer amount versus delay.